Logic Tile Clock Architecture Using U-Turn Paths for Zero-Skew Sync
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Solution Overview
Problem
Existing clock signal distribution and transmission methods in integrated circuits, such as FPGAs, suffer from significant skew delays when clock signals travel between logic tiles, affecting the synchronization and functionality of these circuits.
Innovation Solution
The implementation of clock distribution and transmission circuitry within logic tiles that generates and transmits clock signals with programmable skew, utilizing u-turn circuits and buffers to ensure synchronous and zero-skew clock signals across logic tiles, with the option for on-chip or off-chip clock circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clock signals are transmitted between logic tiles using existing distribution methods, then the circuit can operate, but significant skew delays occur affecting synchronization
Solution Approach 1:
The clock distribution network is segmented into multiple independent clock trees, each serving specific logic tiles. This segmentation allows for localized clock signal distribution with controlled skew, preventing cumulative delays across the entire chip while maintaining synchronization within each segment.
Solution Approach 2:
Different clock trees are configured with different skew characteristics tailored to their specific logic tile requirements. Each clock tree can be independently optimized for its local region, allowing some areas to have zero skew while others have controlled skew, improving overall synchronization without uniform constraints.
2Reliability
If clock circuitry is integrated on-chip within logic tiles, then synchronization control is improved, but device complexity increases
Solution Approach 1:
The clock distribution architecture uses universal clock tree structures that can be configured for different skew requirements. The same basic clock tree circuitry can serve multiple logic tiles with different synchronization needs, reducing overall device complexity while maintaining flexible control.
Solution Approach 2:
The clock distribution system allows dynamic configuration of skew parameters through programming or configuration mechanisms. This enables the same hardware structure to adapt to different synchronization requirements without requiring multiple fixed architectures, balancing control capability with device complexity.
Data Source
AI summary
An integrated circuit includes a plurality of logic tiles, wherein each logic tile is configurable to connect with at least one adjacent logic tile; a first logic tile includes: (i) an input clock path which is associated with an edge and to receive a tile input clock signal, (ii) a plurality of output clock paths, each output clock path is associated with an edge of the tile and includes at least one u-turn circuit to: (a) receive a tile clock signal having a predetermined skew relative to the tile input clock signal and (b) output a tile clock signal having a predetermined skew relative to a tile output clock signal, (iii) a tile clock generation path which includes a plurality of the u-turn circuits to generate a tile clock based on the tile clock signals, and (iv) programmable logic circuitry to perform operations using the tile clock.